How would I count the number of digits to the right of the decimal in a floating point column?

Question

I have table with Latitudes and Longitudes that are stored as floating points. How would I count the number of digits to the right of the decimal in the Latitude column? The data would look something like this:

    DECLARE @MyData TABLE (ID, Latitude float, Longitude float)
    INSERT @MyData

    SELECT 'A', 33.11, -55.2235 UNION ALL
    SELECT 'B', 33.6407760431,-87.0002760543 UNION ALL
    SELECT 'C', 42.2997,-70.9081; 

and I would want this in

    ID    |   LatitudeNumberOfDigits
     A    |    2
     B    |   10
     C    |    4

I was trying to convert it to text and split it up using a . as a delimiter but the CONVERT did not work as anticipated. It rounded to four significant digits

    SELECT ID, Latitude, Longitude, 
    CONVERT(varchar(max),[Latitude]) AS LatText 
    FROM @MyData

Gave me

     ID Latitude    Longitude        LatText
     A  33.11           -55.2235         33.11
     B  33.6407760431   -87.0002760543   33.6408
     C  42.2997         -70.9081         42.2997

Thanks !